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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for It helps in passing:

RNA: It helps pass things on
SIDEMIRROR: Help in passing
EXAMPREP: Help in passing
YEA: It helps in passing
SYNAPSES: They'll help you pass on impulses
TUTOR: One offering help in passing?